package com.zsy.controller;

import com.zsy.pojo.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;


    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //获取原文件名
        String filename = file.getOriginalFilename();
        //进行切割获得文件后缀
        String suffix = filename.substring(filename.lastIndexOf("."));
        //使用UUID作为文件名，避免文件名重复被新文件覆盖
        String UUIDFileName = UUID.randomUUID() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        /*
          exists() 判断文件名是否存在
          mkdirs() 创建文件夹
         */
        if (!dir.exists()) {
            dir.mkdirs();
        }
        //降临时文件存入指定位置
        try {
            file.transferTo(new File(basePath + UUIDFileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        //返回UUID文件名
        return R.success(UUIDFileName);
    }

    @GetMapping("/download")
    public void download(String name , HttpServletResponse response){
        try {
            //读取图片文件
            FileInputStream inputStream = new FileInputStream(new File(basePath + name));
            //输出图片文件
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len= 0;
            byte[] bytes = new byte[1024];
            while ((len=inputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
            }
            outputStream.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


}
